Combination-gage



J. P- DORNEY.

COMBNATION GAGE.

-APPLlcATloN FILED nzc.,3. 1919.

Patented May 24, `1921.v

y a SHEETS-SHEET l.v

.l i i Y-- SE v 1. P. DOPNEY.

COMBINATION GAGE.

APPLICATION FI'LED DEC. 3, 1919.

3 SHEETS-SHEET 2.

INVENTOR J. P. DORNEYIA COMBINATION GAGE.

APPLICATION FILI-:D DEc.3, 1919.

1,379,253. Patented my24,1921.l

IIIIIIIIIIIIITI l IIIIIIIIIIIIIIIJ NVENTOR VMM www? PATENT OFFICE.

JOHN 1. DOINEY, OF WATERVLIET, NEW YORK.

COMBINATION -GAQE Specification of Letters Patent.

Patented May 24, 1921.

`Application led,December 3, 1919. Serial No. 342,162. l

v To all whom 'it may cof/wem:

-the following is a specification.

This invention relates to a combination measuring instrument especially adapted to be used in the tool room of a machine shop where a high degree of accuracy is essential.

By using my invention in conjunction with an ordinary combination square or protrac tor, an instrument is obtained which may be used as a substitute for a number of eX- pensive measuring devices which usually form part of the equipment ofa tool room or a machine shop.

For instance, my invention may .be applied so as to act as a Vernier caliper, Vernier depth gage, height gage, bevel protractor and the like.

Figure 1 is a perspective View of my vernier attachment;

Fig. 2 is a vertical section of the same;

Fig. 3 shows the invention in use as a Vernier caliper;

Fig. 4 is a side elevation of a special'blade used in connection with my invention;

Fig. 5 illustrates the application of the invention to a protractor; and

Fig. 6 illustrates the use of the inventionas a height gage.

Reference will be made in the following description to the accompanying drawings which illustrate the preferred embodiment of my invention and in which like numerals represent corresponding parts throughout the several views. A

The attachment having a body 10 is preferably made from a rectangular piece of Bessemer steel through which are transversely milled at spaced intervals, two grooves 11 and 12,which are lapped to form a snug-sliding fit with measuring blades.

The measuring blades are preferably three in number and of such lengths as are ordinarily used in making measurements common to the particular machine shop, usually such lengths as 2, 4 and 8 inches being desirable. A special blade 15 suitably graduated and having an outlying projection terminating in a sharp point 16, is also provided for use in conjunction with a height gage. Near the base of the body 10 is also milled a groove 17, of such width and depth as to it the blade of an ordinary 12 inch combination square or 12 inch steel scale. Over the groove 17 is attached a cover-plate 19, which is secured to the body member 10 by meansl of machine screws 20 and this plate not only acts as a retainer for the blade of the square, but also contains a bearing for -the cam 21 mounted on a shaft 22lto whichis secured a knurled thumb piece or knob 23. The other bearing for shaft 22 is in the body member 10. The thumb piece 23 and cam 21 being larger than shaft 22 act to retain the cam in position.

The body 10 of the attachment is bored longitudinally and the rod 24 extends through the hole thus formed. The rod 24 .is formed with slots 25 and 26, which are adapted to register with the grooves 11 and 12. The longitudinal position of the rod 24 may be Varied by means of a nut 27, whichl is secured to the threaded end of said rod. The nut 27 is recessed for the reception of a spring 28, which is compressed between the body 10 and the surface of the recess in nut 27 and tends to urge the rod 24 outwardly.

Assume that the attachment 10 is to be applied to the blade 18 of an ordinary combination square as illustrated in Fig. 6, which is accomplished by turning the knob 23, until the small portion of cam 22 is presented to the blade of the square, then inserting the blade of the square into the slot 17 and turning the knob 23 until the cam 22 tightly holds the attachment in position on. the blade 18. The blades 15 and 29 are then inserted in the body 10 by first making the slots 25 and 26 of rod 24 register with the grooves 11 and 12 respectively, then inserting said blades within these grooves and tightening the nut 27. This will compress the spring 28, which will yieldingly urge the rod 24 outwardly so as to clamp the blades in place.

It will be noted that the blades 15 and 29 are graduated to small dimensions and that corresponding Vernier graduations are made on. the beveled surfaces 13 and 14 which are adjacent to the slots 11 and 12 so that a j Vernier reading to a fractional subdivision.,-

shop or on. the surface plate of the inspection or tool room.

*Vernier reading at 13 is then taken and recorded. The blade 29 and square 13 is then used in the same manner as a caliper.

The cylindrical piece A, contacts on one side with the base 30 of the square, and on the other vside with the end of the blade 29 so that by taking the Vernier reading at .13

and subtracting it from the first reading, the diameter of the piece A may be accurately ascertained.

The use of the device as a height .gage is illustrated in Fig. 6. Assume that it is desired to determine the height of a certain object above the surface plate indicated at C. Attach body 10 to the blade of the combination square as previously described and set the square on a surface plate o posite the piece to be measured and a just the body .to` a position slightly in excess of,

the height to be determined, insert the blade 29 in the groove 12,.and advance the blade until it meets the surface plate and record the Vernier reading.

The blade 29 is then withdrawn and the object to be measured is placed upon the surface plate beneath the blade, which is again projected to contact with the upper surface ofthe object. This reading is also taken and the difference of the two readings gives the height of the object measured.

For the accurate checking of lines such as the line B, the blade 15 is used, it being moved until its point 16 engages the line and its Vernier reading then taken. Subtract this Vernier reading from the height of the body 10 above the surface plate as obtained from blade 29 and the remainder will give the distance from the line to the surface plate. j

Fig. 5 shows the body 10 applied to the blade of a i rotractor and it is used in connection wit the special blade 15 to prove the regularity of a surface D. The bladeof the protractor is first set to the given angle and the body 10 maybe then moved up and down and a light mark made b the point 16 will indicate the regularity o the taper of the surface D.

curate in operation and which is capable of Areplacing a number of expensive measuring instrumentsnow generally used.

Having described my invention, what I claim as new and desire to secure by Letters Patent, is

1. An attachment for measuring instruments comprising a body, said body being cut to form a` large groove adapted to receive a supporting blade, and a small groove adapted to receive a measuring-blade', a cover plate for-'said large groove, a cam journaled in said cover plate and body for securing said bodyA in position and a rod slidable longitudinally of said body and coperating with said small groovefor yieldingly holding said measuring blade in adjusted position.

2. An attachment for measuring instruments comprising a body, said body being cut to form one or more grooves having a sliding it formeasuring blades, a rod slidable longitudinally of said body and cut with alike number of recesses, a nut at one end ofsaid rod having a recessed chamber and a spring inserted in said chamber whereby the adjustments 0f said nut will exert a yielding force on said rod for holding the blades in adjusted position in said grooves.

3. An attachment for measuring instruments comprising a body cut to form .a large groove and a small groove, said large groove being .adapted to receive a support- Ing blade, a graduated measuring blade having a sliding fit in said small groove, a coverplate for said large groove, means journaled in said cover-plate and body for retaining said body in adjusted position on the supporting blade, and means adjustable longitudinally of said body for retaining said graduated blade in adjusted position.

4. An attachment for measuring instruments comprising a body. cut to form a large groove `and a small groove, said large groove being adapted to receive a supporting blade, a graduated measuring blade having a slid- 1ng lit in said small groove, a cover-plate for said large groove, means journaled in said cover-plate and body for retaining said body in adjusted position on the supporting blade, and means adjustable longitudinallyl or the like. comprising a body member, a

graduated blade, a graduated pointer, and

means on said body for holding said blade i and pointer in adjusted position, said body provided with Vernier graduations for measuring fractional subdivisions of the readings on said blade and pointer.

- JOHN P. DORNEY. 

